Definition: How quickly you can exhale or breathe air out of the lungs. Over time, it is a measure of how well your asthma is controlled. Peak expiratory flow rate is measured with a peak flow meter.
Also Known As: PEFR or peak flow
Peak Expiratory Flow Rate Definition
By Pat Bass, About.com
Updated February 25, 2009
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
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